Germinable soil seed bank of a gallery forest in Brazilian Cerrado |
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Authors: | Sandra Graciele Pereira-Diniz Marli A Ranal |
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Institution: | (1) Instituto de Biologia, Universidade Federal de Uberlandia, Caixa Postal 593, 38400-902 Uberlandia, MG, Brasil |
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Abstract: | The soil seed bank is a dynamic biotic component of plant communities that represents the population’s memory in relation
to selective events. Few studies have investigated the natural stock of germinable seeds in the gallery forests to evaluate
their regeneration potential, although they are target of anthropogenic action. Thus, seasonal, horizontal, and vertical qualitative
and quantitative variations of the seed bank of a gallery forest in the Brazilian Cerrado were studied to test the influence
of the climatic seasonality, the influence of the physical structure, and depth of the soil in different microhabitats of
the forest in this natural seed store. It was also compared the richness and abundance of species in the germinable seed bank
with the above-ground vegetation. Three hundred and seventy-five soil samples were collected at the beginning (April 1998
and 1999) and at the end of the dry season (September 1998). These samples were collected in three microhabitats distributed
transversally in relation to drainage line of a large stream, at five depths. The density of germinable seeds decreases with
depth, and is similar among microhabitats and seasons. In 24,690 cm3 of soil and 4.05 m2 of litter, 1390 seedlings emerged, being 743 dicotyledons and 647 monocotyledons. From 761 survivors, 263 were Cyperaceae,
206 Melastomataceae, 153 Poaceae, and 82 Onagraceae, the most abundant families. This study suggests that the diversity of
the germinable soil seed bank is lower than that of the above-ground vegetation of the forest, and that the soil seed bank
is not the principal regeneration form of this environment. |
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Keywords: | Pionner species Savanna Tropical forest |
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